Merge pull request #14 from ember-learn/upgrade-mdbook-template

Upgrade `rfc-process-mdbook-template` to use shiki

Author: mansona

config/fastboot.js

@@ -0,0 +1,9 @@
+module.exports = function () {
+  return {
+    buildSandboxGlobals(defaultGlobals) {
+      return Object.assign({}, defaultGlobals, {
+        atob: atob,
+      });
+    },
+  };
+};